Joe, just how many tubes should I buy? I have 2 and now have 5 vintage Singers that use the lube. Who knows how many more just might tell me 'take me home with you.' Maybe I'll get one for each machine and put them with the machines. That way, I might not run out of it. I think I even used a 40% off coupon on them!!! I love the coupons from Michaels, Hobby Lobby and Hancocks that I can use at Joann's. My hubby calls me the 'Joann coupon queen'. I buy very little there that either isn't on sale or with a coupon.