Looking for tips/tricks/websites/resources on collecting

[Quuador]

Glad to hear the Diglett/Dugtrio list are useful. As for where I personally buy cards (I’m from The Netherlands - Europe, though):

@Quuador

I primarily buy my cards from CardMarket.com (English, German, French, Italian, and Spanish cards) and eBay.com (English, Japanese, and Korean cards).

Some other places I sometimes buy from:

• eBay.co.uk / eBay.com.au / eBay.de / eBay.fr / eBay.it for cards from their respective countries
• LPPCollecting.it for Italian cards
• frikea.es for Spanish cards (which are released in Spain - although most Spanish cards are exclusively released in Latin America these days… )
• Yahoo Japan through the middleman service Noppin.com or Buyee for domestic Japanese auctions
• tcgbox.co.kr through the middleman service harum.io for Korean cards
• beehivetcg.com through the middleman service superbuy.com for Chinese cards
• ojamacard.com for Thai cards
• Portuguese, Indonesian, and sometimes Korean cards I buy through a middleman in Brazil, Indonesia, and South Korea respectively
• Misprinted cards through the Gotta Misprint 'Em All Facebook group
• Misprinted Yu-Gi-Oh cards through the Yu-Gi-Oh Misprint Collectors and Yugioh Misprints Facebook groups

Dutch, Polish, and Russian cards I no longer need since I have all Pikachu cards for those languages. But Dutch I would buy at marktplaats.nl (a Dutch domestic website similar to eBay - also owned by the same company. I’m Dutch myself, so those are no issue). Polish cards I’ve bought from various places. And Russian cards I used to have a middleman for as well years ago, although we’ve lost contact. For Russian cards I now try to contact Russian eBay sellers to ask if they could help me with a certain card.

Greetz,
Quuador