Petco/petsmart only sells up to 55 gals dollarXdollar...
And they dont include the 5g or 10g...those used for tank transfer

but still a good sale
As for the trim. If it compromises the frame....are you willing to accept that it may not hold water at some point causing a flood in your home? Id toss the tank.... but as mike said they do sell frames. But for that, youre almost having to remove the old. With what ever adheasive they use. Scrape out remainder clean off with solvents then place the new frame and glue back as well...using something to hold and place Xamount of lbs per to hold.
Not for me. Good luck