DIY can be ridiculously easy and cheap,,,,,,,,,,,,or much harder and more costly, depending on flavor choices, nic level, etc.
I have been DIY for over a year now,,,,,,,,I like simple, single fruit flavors,,,,,,,,my daughter likes menthol peppermint. I no longer use nic, she still does,,,,,,
I can make 50ml of my single fruit flavor for about 2.32. Hers is a bit more,,,,,,maybe 3.50 for 50ml. Nic is the most expensive ingredient, followed by flavorings,,,,,,,so YMMV.
It's definitely worth your while to try it out,,,,,,if you like really complicated flavors, tobacco flavors and some desert flavors, those also require steeping,,,,,,waiting for days-weeks until the flavor matures,,,,,,
I think I started out with about 6 8ml flavors I bought online, a bottle of nic, a bottle of VG and one of PG, some 10ml syringes and a couple of pipettes and I believe my initial investment was less than 40 bucks. Save the empty plastic bottles you're using now, and that's less you have to buy there,,,,,,,
today, I buy nic about once every six months, I buy gallons of VG and PG and flavoring by the 120ml online,,,,,,,cheaper even still.
definitely stop over at the DIY board for more info