Every month the editors of Washington Consumers' Checkbook magazine report here some of the best prices they have found in surveying more than 300 area retailers.

The retailers have promised to hold these prices -- and offer rain checks if supply runs out -- until Oct. 31. It is a good idea to call ahead to check that a product is in stock. Explain to the retailer that you want the price quoted in "Checkbook Bargains." Stores may limit purchases to one per customer.

Here's a partial listing of bargain prices based on Washington Consumers' Checkbook magazine's survey.

Video Cassette Recorders With Wireless Remote

Canon VR-HF710, VHS, HQ, 30-day/8-event timer, HiFi audio -- $589 at all Erol's Television locations, call 642-3300 for nearest location, and Graffiti Video, in the District (296-8412).

Panasonic PV-2700, VHS, HQ, 7-day/2-event timer, Monaural audio -- $269 at Shaffer TV, Vienna (938-6577).

Panasonic PV-4760, VHS, HQ, 14-day/4-event timer, HiFi audio -- $537 at Paul's Audio Video Center, Vienna (827-5797) and The Stereo Man, Arlington (522-5151).

Sylvania VC8922AT, VHS, HQ, 7-day/2-event timer, Monaural audio -- $249 at Twinbrook TV, Rockville (424-8111).

Queen-size Mattress & Box Springs

Sealy Celestial mattress & box spring -- $429 at Columbia Oak, Columbia (596-2500).

Sealy Palatial Crest mattress & box spring -- $479 at Columbia Oak, Columbia (596-2500).

Serta Accord mattress & box spring -- $300 at all Mattress Distributors locations, call 435-6001 for nearest location.

Simmons Beautyrest Royalty mattress & box spring -- $500 at all Mattress Distributors locations, call 435-6001 for nearest location.

Exercise Bicycles

Monark 805 -- $239 at Adam's Bicycle & Fitness, Burtonsville (421-9777), Gaithersburg (840-0484).

Schwinn AD-3 Air-Dyne -- $595 at Wheaton Cycles, Wheaton (949-1649).

Schwinn DX-900 -- $260 at Wheaton Cycles, Wheaton (949-1649).

Tunturi Executive Ergometer -- $279 at Springriver Corp., Rockville (881-5694), Falls Church (241-2818).

Tunturi Home Cycle 3 -- $149 at Accredited Surgical Co., Silver Spring (585-7711), and College Park Cycles, College Park (864-2211).

Rowing Machines

Avita 950SL -- $299 at Springriver Corp., Rockville (881-5694), Falls Church (241-2818).

Precor 615E -- $259 at Springriver Corp., Rockville (881-5694), Falls Church (241-2818).

Precor 620E -- $349 at College Park Cycles, College Park (864-2211).

Tunturi Rowing Machine 2 -- $229 at Accredited Surgical Co., Silver Spring (585-7711).

Tunturi Home Rower -- $169 at College Park Cycles, College Park (864-2211).

If you feel a retailer has not met its commitments, or if you would like to know more about Checkbook magazine's Bargains survey, call Checkbook at (202) 347-7283.