The set is generally considered good-looking and it's pretty rare, combined with the fact that with old packs being made unavailable there's been a lot of inflation as of late.
If you have 180 Cartel Coins I'd suggest transferring to a higher population PVE server to see if prices are cheaper there. With character transfers being discounted until Sunday, it only costs 90 coins to move a toon and 90 to move it back to your home server.