Collect cash

We are based in the UK and do not have a US banking account. We sell supplements and books to customers in the US. Sale values for each transaction runs from $30 to $600. Most of our customers pay by CC or Paypal but some would like to pay by cheque or money order. We need a US based company that can receive cheques and money orders on our behalf, cash them and for a commission transfer each amount to us by paypal or CC.