Yep, new is expensive. Pre owned is little cheaper, broke in, and usually safe. Most of mine are pre owned, in great shape, no issues. Mostly owned, hardly fired.It's honestly difficult to wear out a Glock or M&P. I never buy new if it's available used.
Bought a M10 S&W revolver back in the mid 80's, had some bluing wear from holster, lock up was tight, no end shake. Still have it. Carried for years as a LEO, Security, personal protection, and now retired in my nightstand. Not one issue, never. Shot standard rounds, +P's, SJHP's, and accurate.
Over the yeats had couple new firearms that were nowhere near the quality of my 1974 manufactored S&W M10-5.
Bought used Glocks, also fine shooters. Have a 19-3 for over 20 years with stellar operation. Simple. Shoot, clean, reassemble, good to go. Replace a recoil spring, mag springs, and rack it up and holster to carry. They may show some wear, but internals are like brand new. I estimate the G19-3 has over 10,000 rounds fired, and is tight as new.
Good luck on yours too.