1 USD = approx 32 NTD (New Taiwan Dollar)
Better dive sites are in the south: Kenting is the national marine park, has huge area of beautiful coral reefs. Visiability is medium.
The other 3 southern islands have far better visibility, and are popular dive sites for vacation.
You can find videos on youtube (Kenting, Green Island, Orchid/Lanyu Island, Liuchiu Island)
Most tank rental is NT$150 NTD (US$5) for air and NT$250 for nitrox.
Since most human population are in the north (Taipei), people just go to NE Cape for shore dives (40min drive).
The coast is very beautiful and is always packed with fishers/divers/tourists during summer weekends.
Visi isn't "vacationing standard", but it has many macro stuff if you are into those and photos.
And no need to worry about "losing" stuff here.