Every month the editors of Washington Consumers' Checkbook magazine report some of the best prices they have found in surveying more than 400 area retailers.

The retailers have promised to hold these prices -- and offer rain checks if supply runs out -- until June 30. Call ahead to check that a product is in stock.

Explain to the retailer that you want the price quoted in Checkbook Bargains.

Delivery and installation charges are not included in the listed prices, and stores may limit purchases to those paying with cash or check. Here's a partial listing of bargain prices:

Window Unit Air Conditioners General Electric AME06LA: 6,000 BTUs (British Thermal Units) with 9.5 EER (Energy Efficiency Rating) -- $415 at J.R. Enright Co., Chevy Chase (654-1700).

Amana 5P2MS: 5,200 BTUs with 8.5 EER -- $285 at Alco TV & Appliance, Alexandria (780-5180) and Fredericksburg (703-373-1797).

Emerson 6CC53: 6,300 BTUs with 9.5 EER -- $356 at A & A Appliance in the District (723-3315).

Whirlpool ACQ082XW: 8,000 BTUs with 9.0 EER -- $399 at all Reliable Home Appliance locations.

Kelvinator M205G1Q: 4,700 BTUs with 7.5 EER -- $244 at Metropolitan Appliance, Bladensburg (927-2838) and North Beach (301-855-8905).

Telephone Answering Machines Uniden AM-460: Single micro-cassette unit with beeperless remote and remote turn-on -- $30 at all W. Bell locations (881-2000).

General Electric 2-9860: Dual cassette unit with beeperless remote and remote turn-on -- $50 at all Evan's locations.

Phone Mate 7300: Digital unit with beeperless remote, remote turn-on, time/date stamp and auto-disconnect -- $100 at Telephone Warehouse, Georgetown (333-2900) and Alexandria (548-2998).

Panasonic KX-T1450: Dual cassette unit with beeperless remote, remote on/off and LED call counter -- $60 at all Staples locations (1-800-333-3330).

Panasonic KX-T2385: Combination answering machine/telephone with beeperless remote and 12-number speed dial -- $75 at American Phone Shops, Crystal City Underground (979-9175).

Cassette Decks Teac V-285CHX: Single cassette with Dolby B & C noise reduction and HXPro -- $99 at Saxitone Audio-Video, D.C. (872-8228), Falls Church (321-8273), Rockville (762-8273) and College Park (779-5566).

Onkyo TAW-200: Dual cassette with Dolby B & C noise reduction, HXPro and continuous play -- $197 at Graffiti Video in the District (296-8412 & 244-9643).

Denon DR-M400: Single cassette with Dolby B & C noise reduction and music search -- $197 at Audio International, Georgetown (333-3511).

Carver TD-1200: Single cassette with Dolby B & C noise reduction and HXPro -- $360 at Audio Buys, Bailey's Crossroads (578-3033), Gaithersburg (840-9180) and Manassas (968-7513).

Nakamichi CR1A: Single cassette player/recorder with Dolby B & C noise reduction and two motors -- $299 at Audio Associates, Arlington (525-1889), Springfield (971-1060), Fairfax (385-4464), Rockville (762-3701), Langley Park (434-4740) and Laurel (953-7242).

Widebody Tennis Rackets Wilson Profile 2.7si 110: Over-size racket, unstrung -- $199 at Drilling Tennis in the District (737-1100).

Wilson Pro Staff 4.5: Mid-size racket with stringing included -- $159 at Adidas College Park Sports, College Park (779-8833).

Slazenger Phantom 95: Mid-size racket with stringing included -- $219 at Tennis Unlimited, Gaithersburg (948-7624).

Wilson Profile 3.6: Mid- or over-size racket, unstrung -- $170 at The Court Connection, Clinton (868-8275).

Head Polaris: Over-size racket, unstrung -- $170 at Racquet & Jog, Bethesda (986-0558), Marlow Heights (899-7919), Rockville (770-9177), Arlington (998-5898) and the District (333-8113, 529-6262 & 861-6939).

If you feel a retailer has not met its commitments, or if you would like to know more about the Spring 1990 edition of Checkbook's "Bargains" survey, which lists 3,000 specific models of electronics, appliances and sporting goods, call (202) 347-7283.