Look through your supplies and make a list of what you REALLY NEED. Take the DP with you that doesn't have matching cardstock and only buy the amount of card stock needed to use the DP. If you only have 2 pieces of DP in a particular pattern you don't need to buy 8 pieces of matching cardstock LOL
Avoid buying anything that is not on your list no matter how pretty or cheap it is .
"I have not failed . I've just found 10,000 ways that won't work" --Thomas A. Edison