(b) Sales by financial institutions. A financial institution selling personalized check books, coin banks or other items of tangible personal property subject to tax may do one of the following:

1. (1) Obtain a license, collect the tax from its customers and remit the tax collected along with its monthly returns.
2. (2) Elect not to register and file returns, if in the latter case it pays tax to its suppliers based upon the price at which the merchandise is to be sold by the financial institution to its customers and reimburse itself for the tax so paid by collecting the tax from its customers.