The bad thing about using your personal checks to pay things is it has your account number on it. Companies can "take" money from your account for reoccurring charges just like using a credit card. With the account number someone can clean out your account and there is no limit on liability for losses like there is on credit card fraud. My wife works for a credit union (the largest in Oregon) and sees fraud all the time. If you are going to use checks to pay, see if your financial institution has a bill pay service where they send a check to pay your bills that does not have your account number on it. We use this service and it cost little to no money for the service depending on the financial institution and the accounts you have with them.
As for Sam's Club notify them that you are NOT renewing and not to charge your credit card. Do this in writing and keep a copy. If they still charge you for a renewal report them to the credit card company. In the mean time you could have the credit card company change your card number for security reasons. That would be a red flag if Sam's Club tried to charge the old number later.
Mark V 520 S/N 09-11-01 completely upgraded to Mark 7, with all SPT's & more.
Model 10ER S/N R64000 first one I restored on bench w/ Shopsmith metal ends & retractable casters. Has Speed Changer, Model 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more.
Model 10E S/N 1077 oldest one I have to restore. Will be on bench w/ Shopsmith metal ends & retractable casters.