Well a typical enema bag will clean out your wallet to the tune of $15 or so, but with proper care will usually last several years. Not a bad investment.
If you want to splurge, a 2 quart/litre stainless steel enema bucket will cost upwards of $50, but will last a lifetime. With this you have to periodically replace the tubing and rectal tube every now and then.
Is an enema a friend? They have been for me since I was a child and suffered from constipation as long as I can remember.