Another alternative would be to get the basics of a Freak set, a front & a back + one or two inserts. Then buy more inserts as & when you get the money together.
Smart Parts actually sell what they call a "Boremaster Kit" which is all but one insert plus the case, so you can buy the 2 parts of the barrel with one (preferably largeish) insert then a couple of months later get the boremaster kit (or get someone to buy it for you
). For this kit, you choose which 7 insert you get with it thereby making sure that you have the full set.