オンラインショップで買えるようにしてはいる
Would be grateful if someone could explain this part of the statement :
買えるようにしてはいる
Thanks
オンラインショップで買えるようにしてはいる
(literally) [Someone] has made it possible to buy it in the online shop, at least.
(At least,) It's been made available in the online shop (although you cannot buy it here and now).
Here's the breakdown:
This ようにする means "to make sure that ~", "to set up so that ~", etc. This は is a contrast marker, which can be translated as "at least". This している refers to the continuation of the state.