I got mine at wallmart as well, and I believe it was about 30 bucks.. though it reports codes using a series of flashing lights.. can be tough to decipher.. but if you follow the directions youll be all set... it's 30 bucks... sure beats 130, plus it's small.. fits in your glove box... if that's where you wanna keep it 
-as
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'89 GT Convertible:
TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit
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