Welcome on board mate
I have a soft spot for a TAG myself, they dont get the credit they deserve. Check out the Aquaracer 500m rep, its incredible.
To purchase, check out the dealer section, there are some good dealers who can help you out. I would try trusty or pure time as a starting point.
Here's my new franken 5513.
Josh Case reworked CG's and case aged
Lugs drilled
Gen Fat Springbars
Gen T-19
Gen Insert and Pearl
Gen Crown/tube
Dial, hands and pearl relumed by dazza
Gen 93150 Clasp
WSO 580 Endlinks
I have an MBW bezel assembly on the way and a white lume Yuki dial/hands to mix things up a bit!