Every month the editors of Washington Consumers' Checkbook 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 Sept. 30. A partial listing of bargain prices:

Microwave Ovens

General Electric JE48: Subcompact microwave oven with 0.4 cubic feet, 500 watts, electronic controls and optional hanging kit -- $129, J.R. Enright Co., Chevy Chase (654-1700).

Quasar MQ6659W: Midsize with 0.9 cubic feet, 700 watts, electronic controls, five power levels and two-stage memory -- $160, Alco TV & Appliance, Alexandria (780-5180) and Fredericksburg (703-373-1797).

General Electric JE2810A: Full-size with 1.4 cubic feet, 700 watts, electronic controls, digital clock and 99-minute dial timer -- $190, all Evan's locations.

Magic Chef M41D-10P: Full-size with 1.2 cubic feet, 700 watts and electronic controls -- $269 at A&A Appliance in the District (723-3315).

General Electric JEM31H/J: Midsize with 0.9 cubic feet, 700 watts, 10 power levels and two-stage memory -- $219 at all Reliable Home Appliance locations.

19- and 20-inch Color TVs

Quasar SP2040DE: Remote TV with 20-inch screen, 155 cable channels, MTS stereo, and on-screen display -- $378, Twinbrook TV, Rockville (424-8111).

Panasonic CTM-2066S: Remote monitor/receiver with 20-inch screen, 155 cable channels, MTS stereo and on-screen display -- $399, Paul's Audio Video, Arlington (522-5151) and Tysons Corner (827-5797).

Mitsubishi CS-2070R: Remote TV with 20-inch screen, 181 cable channels, MTS stereo, on-screen menu system and SuperVHS input -- $429, ProVideo in the District (333-9200) and Rockville (231-9800).

Zenith SS-1915W: Remote monitor/receiver with 19-inch screen and 178 cable-ready channels -- $298, Murrell's TV in the District (338-7730).

Panasonic CTL-2063S: Remote TV with 20-inch screen, 155 cable channels, MTS stereo, on-screen display and SuperVHS input -- $397 at Graffiti Video in the District (244-9643 & 296-8412).

Portable Stereo Systems

Aiwa CSD-XL202: Portable stereo system with AM/FM radio, cassette player/recorder and a CD player with 16-track programmability -- $147, Saxitone Audio-Video in the District (872-8228), Falls Church (321-8273) and College Park (872-8273).

Sony CFS-1020: AM/FM radio, cassette player/recorder, two speakers and a three-band equalizer -- $52, all Evan's locations.

Magnavox AZ8100: AM/FM radio, cassette player/recorder and a CD player with 20-track programmability -- $159, all Reliable Home Appliances.

Sony CFS-902: AM/FM radio, cassette player/recorder and auto shut-off -- $78, all W. Bell & Co. locations.

Panasonic RX-DS660: AM/FM radio, cassette player/recorder, auto reverse and a CD player with 20-track programmability -- $329, Graffiti Video in the District (244-9643 & 296-8412).

If you feel a retailer has not met its commitments call Checkbook magazine: (202) 347-7283.