You’re pretty much stuck with ordering online, and now isn’t the best time for shipping with our temps. Try searching for a local reef club, I didn’t have any luck with that though and I’m in Buckeye. I’m on my third try with Berghia. First two shots did nothing. Peppermints, file fish, wrasse, copperbands will eat them. They may not reproduce in your tank if it’s high flow, if you have amphipods, or if you have bristle worms as they will eat the eggs. I just ordered 50 from salty underground a month or so ago. I kept a few in a one gallon tank to breed. If you have a little patience, you could just order a small amount and let them lay eggs in a small container. In about four weeks, the eggs will hatch and you’ll have a ton.
edit. Once a month they have a sale, I don’t remember when. Also, if you put them in your cart and wait 20-30 minutes, they will email you a discount code.