Aiptasia comes from the frag plugs, corals, snail and crab shells that you will put into your tank anyway. Don't believe the pest-free live-rock argument for a minute. The first thing that you put in your tank is capable of bringing in everything that you never wanted.
The pacific live rock has to cycle - aiptasia will not survive this.
Go to a few of the good stores around you and ask to buy uncured LR by the box. Price compare and shop. This is as cheap as you can buy it. Add in another $1 a pound, or so, to cure it yourself. If there are none, then Google will find some places for you online. Fiji Pukani is usually available. You might even be able to manage a drive down to LA and buy some really cheap from a wholesaler.
They might ask you about boat rock - this is stuff that is boated after being collected before being put on a plane to you. It is out of the water for a lot longer. This is fine. The live creatures on the rock are not what you are after. You are after the phosphate free rock that is full of bacteria, nooks, crannies and porous structure. Boat rock can take a bit longer to cycle, but will look like any other rock in six months. It is usually really cheap.
Whether you buy TBS or pacific rock, nearly all of the stuff that is on it will be dead a number of months - it is not suitable for aquarium life. The rock is the prize, not the inhabitants. The good inhabitants will all come back - the coralline, pods, sponges, etc.