I think it's best to buy your own 2 stage vacuum pump.
A real good new Robinaire 4 CFM 2 stage pump can be had for around $225 shipped.
I bought this one and it's excellent
http://www.thetoolwarehouse.net/shop/ROB-15434.html
You'll need it more than once and you'll know it's in good working shape with clean fresh oil in it if you buy it new.
Nice manifold gauges are usually around $60 on up. Harbor Freight has some for about $40 that should work well.
Always unscrew the yellow hose from the manifold gauge enough to purge the air out of it before filling the system so you're not putting some air back in when charging. It's obvious when the air has been replaced with R134 at the fitting, then tighten it back up and start charging the system with the R134 bottle right side up so gas is going in and not liqued (unless you really know what you're doing) or you may hurt the AC compressor.
And a good vacuum pump is about the same price as paying a shop to do a quickie consumer level 15 minute evacuation and R134 charge here in S. Florida.
You can buy R134 in 30 pound bottles for around $100.
Thats enough refrigerent for about 10 fills depending on the car your doing, so you can do your other cars or friends too.
No shop around here will ever do it right... it takes way too long, oil has to be changed frequently in the vacuum pump (they don't), and they need to do it quick and move on to the next car to make money.
You have to do it yourself to have it done right these days.