Pawn shops will often carry a line of "new" guitars these days to have something shiny to hang next to the beater used guitars that they get in. My guess is that's what this particular pawn shop has done in your instance. One in my area has almost the full line of Johnson acoustic and electric guitars at some rather attractive prices (lower than other economy brands like Squier).
A quick search on the Slammer brand shows that they are a subbrand of Hamer (kinda like Squier is to Fender). Hamer makes outstanding, top quality instruments at high prices, but I have no experience with the Slammer brand.
I've never heard of Crestwood guitars, and couldn't comment. I found one New Jersey store that sells them for $99.00 a piece. These are Strat copies of undetermined origin or quality.
For a few dollars more, the Squier line is available, with decent quality (as has been noted freqently here). For the same price range, you could get a Squier '51 Vintage Modified, which has received rave reviews here at TheFret. Squier also has two solid alder special edition Strats (in cherryburst and Silverburst, both fantastic finishes), with a street price of $199.99. Spudman, I think, might own a few (including the two mentioned above), and is well qualified to weigh in here... The Squier Tele I played not too long ago had the same fit and finish of its Made in Mexico brethren, and that Tele twang was present. A solid, well made guitar for under $200.00!
Also, there is a good selection of guitars in the same price range at Rondo Music, with thier SX line. Tremoloman gave a solid review of the SST (Strat copy) 57 model in Powder Blue. These guitars have a long history of reviews, and the good and bad is available for your perusal.
With all that said, did you pick one up? Play one? How did it feel to you? If it feels good and sounds good, the tuners are smooth, the neck is straight, the knobs aren't scratchy, the nut and bridge looks good, and there are no glaring manufacturing defects, then you may have found a good guitar!
Guitars:
Fender 2006 MIM Fender Stratocaster HSS in 3TS
Ibanez RG 570 with a bridge Invader
ESP M II Deluxe with a Tune-o-Matic bridge
Eleanor, the magical, mystical Road Worn wonder Tele
Blackstar HT Club 40