I agree with killerqueen most boxing gyms are cheap...MIND you I am speaking of gyms that are strictly boxing gyms not one of those big fancy gyms that offer boxing...I own a gym upstate NY and I only charge $45 a month but you use all my equipment and either me or my partner are always there to work with the members one on one. If needed. If you are not a member and want one on one training sessions they are $30 and hour which is still fairly cheap around here.....
if you get your own gear and that ( Gloves $35, Head gear $50, Cup $50-75, mouth piece $10 ) give or take a few bucks depending on where you get them and brand you are set up with all you need there for under $200 and have them where ever you go...When you talk about travel and other things thats a different story...but the basics are cheap enough