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 rainchecks if supply runs out -- until May 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.

A partial listing of bargain prices: COMPACT DISC PLAYERS

*Yamaha compact disc player, model C2X2 -- $249 at Audiokrafters, College Park (864-7557), Rockville (881-8743), in the District (965-1313).

*Sansui compact disc player, model PCV750 -- $259 at Paul's Audio Video Center, Vienna (827-5797) and The Stereo Man, Arlington (522-5151).

*Sony compact disc player, model CDP70 -- $299 at Audio Buys, Bailey's Crossroads (578-3033), Gaithersburg (840-9180). TENNIS RACKETS

*Kennex tennis racket, model Silver Ace, mid-sized head, graphite frame -- $70 at Racquet & Jog in the District (333-8113) or (861-6939), Bethesda (986-0558), Vienna (281-9386).

*Dunlop tennis racket, model Black Max Pro, mid-sized head, composition frame -- $99 at Drilling Tennis Shop in the District (737-1100).

*Prince tennis racket, model Graphite 90, mid-sized head, graphite frame -- $175 at Tennis Unlimited, Gaithersburg (948-7624). FREEZERS

*White-Westinghouse freezer, model FU166H, upright model, 16.0 cubic foot capacity -- $419 at A&A Appliance Co. in the District (723-3315).

*Whirlpool freezer, model EV15HKXR, upright freezer, 14.6 cubic foot capacity, frost-free -- $499 at Alco Electronics, Inc., Alexandria (780-5180).

*General Electric freezer, model CA16DF, upright model, 15.7 cubic foot capacity -- $499 at J.R. Enright Co., Chevy Chase (654-1700). DISHWASHERS

*General Electric dishwasher, model GSD600D, pot scrubbing cycle, energy saving dry -- $309 at J.R. Enright Co., Chevy Chase (654-1700).

*Maytag dishwasher, model WU1000, pot scrubbing cycle, energy saving dry, electronic controls -- $599 at Bul's Maytag Home Appliance Centers, Rockville (231-0844), Silver Spring (589-3363), Vienna (281-4890), Springfield (644-2977), Alexandria (765-2206), Fairfax (385-9717), Herndon (471-0881). MICROWAVE OVENS

*Litton microwave oven, model 1445, 650-watt cooking power, .8 cubic foot capacity, electronic touch controls, 10 cooking levels -- $189 at Alco Electronics, Inc., Alexandria (780-5180).

*Panasonic microwave oven, model NE6970, 600-watt cooking power, 1.0 cubic foot capacity, electronic touch controls, variable cooking levels -- $259 at Alco Electronics, Inc., Alexandria (780-5180).

*Tappan microwave oven, model 564994, 650-watt cooking power, 1.3 cubic foot capacity, electronic touch controls, 10 cooking levels -- $359 at A & A Appliance Co. in the District (723-3315). CEILING FANS

*Supreme ceiling fan, model Mark IV Deluxe, 5 rattan blades, 42" blade sweep, polished brass finish -- $65 at Factory Showroom, Rockville (340-0430), Gaithersburg (869-8000).

*Hunter ceiling fan, model 25606, 4 white blades, 52" blade sweep, antique white finish, 3 speed reversible motor -- $175 at Fan Fair in the District (342-6290).

Casablanca ceiling fan, model 12002T, 5 blades, 52" blade sweep, bright brass finish, light included, computerized wall control -- $355 at Lighting Limited, Silver Spring (588-6975). POWER LAWN MOWERS

*Snapper power lawn mower, model 21351, 21"-cut width, rear bag, 3.5 horsepower -- $312 at Kohler Equipment, Landover (577-8111) and South Potomac Lawnmowers, Fort Washington (292-4444).

*Lawnboy power lawn mower, model 4600, 20"-cut width, rear bag, 4.0 horsepower -- $330 at Lanham Bicycle & Turf, Lanham (577-9763).

*Toro power lawn mower, model 20680, self-propelled, 21"-cut width, rear bag, 4.0 horsepower -- $448 at Maryland Cycle & Equipment, College Park (474-6723).