You can buy an upgrade kit using the same Sharp screen from the Dell XPS series for the X220/X230. The best bet is to go through a TaoBao agent and buy it from nb51 directly.
I own an X220. any hint how not to fail when attempting this? I.e. some english writeup that is usable with instructions et al. All the stuff seems to be in chinese only :-/
I mainly followed some videos on Youtube for the X61/62 like this: https://www.youtube.com/watch?v=bcaMFkd_xSY (this one is for the X220). The X220 is a bit easier since there is a big community following for the HD mod [1]. I'm pretty sure the HD mod started from nitrocaster.
Edit: Buy some Gaffers tape too. Much easier to use to tape things down compared to electrical tape.