get some ipv6 proxies (you can get some for like 15 cents each), create the slave accounts by yourself directly on that proxies… and as you don’t have much budget, work your ass off LOL
Goodluck!
While @losek 's comment was kinda direct… he has a point.
Are you really really sure that you will reach your goal with the path you have set in your mind?
Your (avg) minimum cost per account will be:
1-2$ for the account
0.3-0.6$ for a high quality virtual phone number
1-3$ for a good proxy
Problem with that budget tho is that it does not calculate in testing, which is the biggest money sink. The above numbers are for an already working and well tested setup.
If you want to go the cheap route you could always use your phone as an internet hotspot and use the mobile IP for your actions on the accounts, buy a few local simcards and create the accounts yourself.