3,213,529
amazon. Just did a quick check and found dozens, some said universal, gave measurements.
1,538,744
If it's the tank lid, try calling the manufacturer or checking their website.
1,157,841
You can Google it, Bing it or Yahoo! it. Alternatively, Home Depot, Lowes or another place might have what you are looking for.
6,689,449
Try a habitat for humanity store, they get lots of used construction stuff.
2,707,826
Those are tough to come by...online searches will be your best bet. If you know the manufacturer, their website might have the lid. But it seems you are often stuck with having to buy a whole new unit
3,988,138
Not sure what part you are looking for when you say toilet lid back. Are you talking about the tank lid? My experience with them is that you will have to replace the whole tank but you can salvage the the bowl. Check online.
212,810
I'd say Lowes.com, Amazon or just Google it. I am sure Lowes or Home Depot will ship it to you or your local store.
1,580,843
That's really odd that you can't find a good size. I would call a plumber and ask?
1,770,940
I would go direct to the manufacturer online or Google the part or model # and see what comes up. Good luck!
3,986,473
472,214
2,324,712
552,229
As crazy as it sounds you might try ebay or somewhere online. If all else fails replace the toilet.
1,262,452