So you're getting old Alu 80's, presumably out of hydro, for $35 (a steal) and for an additional $30 getting them hydro'd VIP'd and filled? A steal, simply a steal, at a total of $65 for a freshly hydro'd tank, with regulator, filled.
By the way, the only "law" about tanks is from the DOT, and the DOT require all tanks to be VIP'd before the hydro test is performed, by the hydro technician. The dive industry pretends you still need a dive shop VIP (or more, for aluminum tanks from a certain age) even on a new tank, but the fact is that under federal law, if the tank has been hydro'd, it has also been VIP'd. The duplicate VIP is one of many common rip-offs by hungry dive shops. But then again, most would charge you more than $30 just for the hydro anyhow.
Presumably you are SCUBA certified...you'll find most shops won't fill tanks without seeing a C-card.
You might also want two mallets, or two mauls, to set zincs. I've found that you really need to hit 'em from both sides at once in order to set them tightly, or else they tend to work loose from the shaft. Hit 'em from one side only, and they just go back and forth.