I went to St Louis with my GF and her kids for a little vacation around the 4th of July.
This may be just a hair out of budget, but, it's not MUCH more expensive than super 8, but it's MUCH nicer.
We went to the
Holiday Inn Express in Cahokia
We got 2 rooms, one with a king bed, and one with two double beds and a couch. Rooms were big, The room with the king bed included a refrigerator/microwave. It had a sofa too, with a table in front of it. They have a pool. Their continental breakfast is quite good. It's not just a little cart.
Also, I know this is pretty much standard at most places these days, but they have 802.11 wireless access available (no extra charge), as well as a PC with net access and a printer that guests can use (no extra charge).
Anyhow, on a weekday, for just 1 room, Orbitz.com is telling me the price next week is between $50 and $60.
If I go back to St Louis, and If I want to stay at a decent place without overextending my budget, Holiday Inn Express is probably my #1 choice for next time ....