I tried buying mine right from Racetronix. He told me that they only sell to distributors. I used Heartline Performance. She was very helpful & my order was placed without any problems. I'm sure she could get you a price if she hasn't any 340 pumps in stock. Racetronix indicated they are in stock at their facility. I purchased the Hotwire Kit & Fuel Sending Unit w 120 ohm (for digital dash gauge) & 255 lph Pump for $460. The larger pump shouldn't be too much more.
I'm running the stainless steel Racetronix sender with 340 LPH pump as well as their hotwire kit and new feed and return lines. This was install into a new Spectra GM307c fuel tank. Everything fit perfect and zero issues.