have you tried reptilinks?

[Alvadore]

I tried a 25gm link with my female Columbian Boa.
First attempt she did not recognize it as food, would not strike.
I emailed ReptiLinks and the owner replied asking me to call him, which I did.

He recommended first rubbing a mouses behind all over the link to give it a scent my boa would associate with food, if that failed he recommended giving her the mouse, then gently inserting the link while the mouses tail was hanging out. The first method failed, but the second worked. He said that once she developed a food association with the links, going back to natural prey and back to links would be confusing, and not advised.

Here's the problem as I see it.
My local shop that sold me the 25gm rabbit link doesn't carry 100gm links, which is the appropriate size for my boa. They told me 2 weeks ago they would order some, but still no links in stock. I've decided to attempt to switch over once they can guarantee a reliable stock of 100gm links. Otherwise I'll bide my time until I buy a small freezer so I can purchase 50 100gm rabbit links to save the shipping fee.