By Colette Bennett Prices for several key components of the holiday are up a lot as the summer gets underway. Everyone looks forward to Memorial Day weekend for different reasons, from that extra day off to fall asleep on the couch to the excuse to eat endless piles of grilled meat and drink beer. And while Americans will still be celebrating this year, high costs on everything from groceries to gas mean that the celebrations may be more moderate (or, for some, skipped altogether). While those with higher incomes may be better equipped to deal with the burn of rising costs, as many as 50% of l…