I agree, grrrrrrrrrrrrrr.  

Yesterday I had a buyer buy 2 items & paid by e-cheque, now today the buyer has bought another item & paid by Paypal straight away.

I have sent them an email asking whether they want me to send the newer purchase with the other purchases at a reduced postage.

I can't understand why they did an e-cheque first - especially when I ask buyers NOT to use an e-cheque.  I've already warned the buyer that the e-cheque will delay posting of the items.