Paulman182,
I had a similar problem this week, a Panasonic PT52LCX66 with a popped bulb.
"Lucky" me, I found Bulbtogo.com and they had a TY-LA1001 replacement lamp for $129... It shipped priority(?) through UPS, for free with a coupon code, and arrived yesterday. When I got home there it was on my front porch, a full day early, imagine my delight... until I found it was not quite a fit for the enclosure. They sent me an OSRAM P-VIP 100-120/1.0 P22 h, which I suspect may actually be the equivalent for TY-LA1000, not the 1001. I forged ahead...
I modified the plastic TY-LA1001 enclosure(I figured my alternative at this point would be to buy a full assembly anyhow) -snipped a bit of plastic here and there(wiring clips that were in the way) and added longer screws(4-40) to the enclosure because the larger bulb/reflector didn't quite seat fully inside the depression, added another screw to help pin the power connector in place because the cover wouldn't quite hold the other side of the connector due to the larger bulb displacing it, had to find a screw and nut to fit the bulb because they weren't supplied, went to install the whole mechanism and found it no longer fit because the case was now wider due to the bulb not being fully inset in the enclosure! Grrrr. Out it came, off came the cover, and after a slight bit of meatball surgery, cough -creative and exacting modification, to the rear of the cover with an X-acto saw it now fit past the internal guide rail and installed with a slight wiggle to seat the connector.
It's working fine so far, possibly a bit less bright than the old bulb -it's debatable, still only has a few hours on it(I cranked the brightness and RGB color levels a tad to compensate), and I think the TV seemed a bit dim when new, but recall it either got brighter or I adjusted(bulb burn in?). It's not quite lined up perfectly straight in the enclosure, but is correctable if I feel the need to machine the inset in the enclosure a bit larger to get "perfect" alignment. Frankly, I was anxious to see if the bulb was going to work at all and could've/should've spent a bit more time to machine it properly so the bulb was perfectly parallel.
I wouldn't necessarily recommend the path I took for the faint of heart, but it's apparently a workable solution, if perhaps not a highly recommended one, and I'm watching HDTV again rather than still searching for a bulb replacement that only seems to exist as a complete module.
I suppose that what one should take away from this is that for the time being one should be very careful about buying a bulb advertised to fit into a TY-LA1001 enclosure -they are apparently still a rare breed.
Should you find a retailer or etailor who claims to have them, for the time being I'd suggest getting them to provide you with measurements and removing and measuring your own TY-LA1001 bulb/reflector to verify. For anyone who does find a fit, please post here. I'm sure there are others who would benefit.