i build the bikes for Kmart and Target. I would recommend getting a Target bike over a Kmart bike. Target bikes are generally a little bit better quality. They have several for around $75 which are decent basic bikes. Just don't expect too much. Glacier Points I think are around $50 and are actually pretty good for the price. If you buy a bike at Kmart, try to stear clear of the Stone Mountains....but you didn't hear that from me. My favorite to build are the Schwinn Rangers at Target. Very solid bike and well made. They are $139 but go on sale a lot. For the bikes that Target sells, Schwinn are the best quality, followed by Magna followed by Huffy.
Also, we get bikes that people return for no real reason all the time, we repair them and Target and Kmart generally take a pecertange off of the bike and sell it as is. They are for the most part like a new bike. Anything that was wrong with them, we replaced or fixed. So that's a good way to save some money. We put a green repaired tag on them so that's one way to identify them, otherwise just ask the sporting goods manager if they have any repaired bikes marked down for sale.