Maybe the loan wasn't for the $140.oo. He could have been getting the loan, and would use part of it for the $140.oo cost of the snakes. Maybe the loan was for enough to get the snakes, enclosures, and some for upkeep?
Even if the loan was for more(or for something else) everyone is correct in saying to reexamine the purchase. Getting animals(even really good bargains on really cool animals) is a big deal, and you have to think ahead months and years. Can you house them, feed them, take care of them?
If you have that worked out, and you already have enclosures, and can take care of them.. there's nothing wrong with normals, and nothing wrong with dinker projects if you think you 'see' something in them.
Just be sure you've thought it through.