Crafting and D&D

Dwarven Forge dungeon tiles

A few weeks ago I opened the Pandora's Box of D&D Dungeon Crafting... yes I'm now doomed, because —let's admit it— as with dice, you can never have enough dungeon terrain for your table top gaming.
I've been looking —for a while now— at those gorgeous images of 3D dungeons people post in table-top gaming forums. I'd also pondered —for a while too— about buying some molds (Hirst Arts seems to be the staple) and start working on my very own 3D dungeon tiles.
But two things had been stopping me from buying them, a) I'm not sure the required materials are easily acquired in my city (I'm from Mexico), and b) I'm sure I won't have enough time to do all the cool things I would like to do.
Another option could be to buy pre-made sets, like the ones made by Dwarven Forge, but a) my budget is already thin enough gaming-wise and b) do I need to mention a point b)?
Nonetheless, this is a part of the hobby that's been flirting with me since the mid 90's, when I used to buy at my local magazine store the White Dwarf issues printed in Spain, just for the cool pictures and crafting tips, even if I couldn't get any Warhammer minis at that time.