One middle ground between spending $100-200 and snipping off your only cable is buy a replacement cable and snip the end off it. That way you still have your cable with TRS plug and a cable that works with Lepai. Still the cheapest replacement cable I could find runs $69:
Honestly though, spending more than 3 times the price on cables than your amp sounds retarded.
Edit: Found this to be more reasonable: http://btg-audio.com/webstore.htm#!/~/product/category=2609074&id=11498572
You could ask them to customize to 4 pin XLR. That way you got flexibility in the future (ie. use with HE-Adapter to connect to tube speaker amps).
Edited by Sonido - 10/16/13 at 5:55pm