1) Consider the PTCGO is you have more time than money. Of course, it does demand a lot of time until you have a decent cardpool.
2) Unless you stick to the Theme Deck mode. Which is an option for the physical TCG as well.
3) Another option, if you've got fellow casual friends, is to focus on either the Battle Arena Decks or the World Championship Decks (the commemorative ones). Treat them like "Board Games" instead of TCG materials, and leave them as is, with each player selecting a deck and going at it. Bearing in mind that I'm not talking about mix and matching the two; you might be able to have Battle Arena Decks face off against other Battle Arena decks other than the one with which they were sold, and you can have World Championship Decks face off against the other three from the year they represent.
4) Pokémon League is an option, but your mileage may vary. Some are quite casual, others quite competitive. I haven't been able to attend a Pokémon League in over 10 years, but when I was a regular and semi-regular, there were both kinds of players.