I know I need to keep it cheap too, we are inviting 200 people (hope they all don't come!) I am only doing a bag per room or couple/family so that should cut down the price a lot. But here are some of the bargains I've found (and I just started looking).
Bags - 60 cents each, but I'm not sure what size they are I'm more of a visual person.
Gift Tote bag
For the contents I am going to buy bulk sizes of pills, band aids, aloe and hand sanitizer then fill up smaller bottles - so far this seems cheaper than buying individual bottles already filled.
Here are a few sites for those - not sure which ones are the best prices yet!
Plastic Bottle & Cap- 2 oz capacity - Travel Size Other Products Products - Minumus.biz
http://www.sunburstbottle.com/plastic-bottles/clear
MMS - Bottles
Also think of things friends or family can get you for cheap/free, My mom is a dental hygienist so we are going to throw in a toothbrush and toothpaste, my MOH is still in school so she is going to raid the health center and get condoms for the younger guests and her friend's dad works for tums so we are getting those for free too!
Oh and I was going to make a personalized puzzle book, you can make the puzzles online with whatever words you want (bride, groom, tequila!) so I don't have to buy those!
I'm glad you did this thread though I am looking forward to see some of the deals.