You might want to email these guys and talk to Marc. They are a tactical/security supply company and they are usually pretty competitive on price. I bought a UTLMKII from them and am very happy with it. I shopped around quite a bit and found that it was going to be expensive addition regardless of the brand name, so I ended up going with the one that was made for the pistol and I don't regret that decision now.
[email protected]
Marc Wollman
PO BOX 136
Forked River NJ
08731
office 732/286-9868