When I am poor and need to travel, I stay at hostels. There is a website for "hosteling international." Google it. Most medium to large cities in the US have hostels. Some are CHEAP. None were more than $25 a night. All had rentable lockers for computers/valuables/nice clothes. Here are the ones I stayed at in the US, with descriptions of the experience:
New Orleans: fun people, clean rooms, but flea-ridden outdoor common areas.
Atlanta: nice hostel in decent (but not great) part of town. Clean building and clean, fun people.
Denver: somewhat icky part of town, about a mile walk to downtown. lots of homeless people. Free food. dirty, but fun people.
If traveling is killing your budget. Hostels really can help out a lot. Also, they almost always have kitchens available, so you can buy cheap food at the grocery store and cook it at the hostel. Not glamorous, but if you are complaining about spending 1000s of dollars on med school....
I had a friend who was going to apply to the usual 10-13 schools, then realized that she really didn't look forward to going to some of them, so she changed her mind about ~5 of them. This saved her tons of money. And it makes sense. If you would rather not go somewhere, don't apply.
If you find a school that accepts you and you know you will be happy there, you *could* save money by accepting and not interviewing anywhere else. But that only makes sense if the loss of opportunity is worth the money you are saving.
For those of you who aren't in the current app cycle, consider EDP. If you aren't trying to get into a school where the average scores are higher than yours, it will probably work out for you. EDP saved me a bundle. I only spent ~200 for the MCAT, 160 for AMCAS, 70 for a secondary, and 50 for my acceptance deposit. I could have applied to "nicer" schools, but my local school is ranked ~23rd or 24th, and I didn't want to move. Plus, the EDP schools are supposed to notify you yes/no in time for you to submit apps to other schools for regular admission. I found out in late September. What did I do with the money I saved? Bought a TIVO and some furniture. Woo!
Just wait. I have a friend who just finished school and got hit with all these county, state, and federal licensing & registration fees, etc. It all ended up costing about 1500 bucks (which he didn't really have at the time) and he couldn't NOT pay it, if he wanted to practice. No one warned his class about such surprises, or informed the graduates that they would need such funds set aside.
Good luck to all of you with your interviews, and with saving money!