Horizon Card Services is no longer marketing Principal Platinum. We suggest these alternatives instead.
Net First Platinum
Apply Here 
Net First Platinum is also issued by Horizon Card Services and has identical terms.
Merit Platinum
Apply Here
Merit Platinum is another card by Horizon Card Services with identical terms. No credit checks and $750 credit lines to start.
Zebit
Apply Here
Zebit is a great online store that offers 0% APR for 6 months and gives you up to $2,500 starting credit limit. There are no credit checks as well.