Why not simply use someone from Charlenesbags to do your back linking for you?
Backlinking isn't something that you can easily hire someone to do without running into all sorts of problems.
I've found that the best way to create back links to my shop is to
1) update my blog (and include a link back to my shop in the post)
2) comment on other blog posts (my comments and avatar always link back to my shop)
3) be active on forums outside of Etsy. In your signature you can include a link to your shop IF its permitted in that particular forum
So there really isn't any way a company can do this for you at all.