I haven't seen this thread on here before, and if it does exist there certainly isn't one that is active... I am going to link (non-affiliate of coarse) everything that gets said so it can be a comprehensive list!
1. A drying Rack -
http://amzn.com/B00H7P1GPO - Don't buy this one, you can find cheaper ones in stores
2. A Soap Holder -
http://amzn.com/B000DZFA66 - This makes your soap last like 10x longer, and keeps it cleaner. Again don't by the one on amazon, they sell them at the dollar tree
3. Spray Mop -
http://amzn.com/B00KB75YE4 - This isn't the exact model I have, but I advise one like it that has a spray handle and not ones with motors like the Swiffer Wet Jet. Also make sure you get one that the cloth is washable, if not you can usually just attach a $1 microfiber cloth to it, just please don't by disposable pads. You can replace the liquid with vinegar water, bleach water, generic floor cleaner and water, etc.
4. Wash Clothes -
http://amzn.com/B00P1M12XG - I have never bought paper towels in my life...seriously, people don't believe me when I say that. I keep one of these hanging on the handle of my oven and dry my hands on it. I keep saying I am going to buy a hand blow dryer, but haven't yet.
5. Foam Dispenser -
http://amzn.com/B00OCB455E - You may have one of these laying around your house, there are all kinds of how-to instructions to make one out of a mason jar... Long story short fill whatever container you have with 1/3 soap and 2/3 water and shake it. You now have foaming soap...and it lasts 1000x longer.
6. Speaking of Mason Jars -
http://amzn.com/B001DIZ1NO - Why don't you have like 1000 of these things? They are the most useful things in the world... I use them as replacements for ziplock bags, cups, shaker bottles etc. You can put them in the freezer, you can put them in the microwave. I threw out all my plastic food containers and replaced them with these many many moons ago without any regret. One not-so-mustachian thing to say is I always go name brand on these.
(From Username: Ketchup)
7. Big Ass Chest Freezer -
http://amzn.com/B00O9ZKZHU - Make sure you keep it full and it will use less energy
8. Safety Razor Set -
http://amzn.com/B00T5EQC1I 9. A Good Case for Phone/Tablet -
http://amzn.com/B015PKNZ74 - Let me just say, for awhile there was a rumor that if you broke your phone in an Otterbox that they would replace it for you, but that is not at all true, so there is no real reason to not get a knock-off
10. 5-Day Cooler -
http://amzn.com/B0052EBRC4 - One of the only times my family eats out is when they are on the road, just throw some sandwich stuff in this baby and you are ready to go. Also check out videos on how to properly pack a cooler and you can learn to make your ice last much longer.
(From Username: Kaizen Soze)
11. A Spray Bottle -
http://amzn.com/B00008VXNE - Fill it with dishwashing soap and spray your dishes to make soap last way longer
12. Gym Equipment/ Membership