This is going to date me, but I spent about $300 (all figures converted to 2022 dollars), for things like printing and making copies at Kinkos, fancy-ish paper, envelopes, and postage. I only did one long distance trip out to Palo-Alto (from MA), but stayed with a current intern and my wife came with me so me made it a vacation (probably about $1500 in travel expenses). All other interviews were within driving distance, and I was able to stay with classmates if i needed to. I had a few other trips booked, but luck and perfect timing meant that I was able to accept my first choice intership, prior to match day, and it would be an APA approved internship (not sure that would work today). I was able to cancel some flights and hotels (I would have likely had at least another cross-country trip). Moved about 150 miles away for internship, so about $350 in van rental fees. Expense was one of the reasons for choosing the relatively local internship. I had been "groomed: to go to Palo Alto VA, but it was just too damn expensive out their. Also, my wife worked in a licensed profession (PT) and staying local allowed her to continue to work without needed to get another license.