My BIL and SIL are very frugal. Several years ago, they purchased a split level home with the lowest level being a gravel crawl space. It took about 3 years but my BIL dug out the crawl and made it into a basement one bucket at a time. He would carry out buckets of rock/dirt/clay and load it on to a trailer. When it was full, he would tow the trailer to a nearby dump that would take it for free. My DH spent many a day/night there helping him but when it was time for us to put in our new flagstone patio, BIL was nowhere to be found when we needed help moving 5 tons of crushed limestone and 4 tons of stone.
BIL and SIL pay cash for everything (they even paid cash for their Mountaineer when Ford was offering 0%)
They recently got dial-up internet. Before, they would go to the library but realized that it was probably more in gas to drive the kids back and forth for school work. SIL recently got into genealogy so she spends most of the day on line. They do not have cable or cell phones. My FIL was very sick and recently died but my MIL would get very mad when she would try and call and get a busy signal and had no way of getting a hold of them. My BIL had to leave work to tell his wife about the shooting at NIU (they have a daughter there) because she was on-line and he was just getting a busy signal.
The only vacation that they take is for two weeks in MN to stay at my other BIL's lake house. The only cost to them is the gas to get there and their food. They never offer to give my BIL money to put towards his electric bill to at least cover the cost of the air conditioning.
They used to have a Sam's Club membership (under my business) but now they go in showing the old card and "shop". They then go ask my other BIL to come back with them to get the items using his membership (under my business). They know better than to ask DH or me because I would say no. They're just too cheap to spend the $35 for the year but want the benefits.
The funny thing is the SIL will think nothing about spending $400 for an antique lamp since she's into antiques.
I have to admit that I am a bit jealous. My DH and his brother make about the same amount of money. I work from home and although SIL is a dental hygienist, she hasn't worked since her children were born and doesn't ever plan to (she never renewed her license). Their home is paid for where ours is not. We have a lot of other expenses that are out of our control (mostly medical) but we do have a dish, DSL and cell phones. I know that it's our choice but now that we have them, I can't imagine not.
As for me, I do reuse plastic-wear. I wash them in the dishwasher and they come out fine. I've also been known to reuse birthday candles. I shop at Aldi for many things and buy most of my meat early in the morning at Sam's Club when it's discounted.