Here in the US, the cheap shoplight fixtures available at Home Depot have electronic ballasts designed for T-8. The model: "Commercial Electric" Shoplight (with SKU#140-904) have a Sunpark electronic ballast mounted in them... and cost about $9
READ AND DO THE FOLLOWING
AT YOUR OWN RISK
In fact, for a really cheap 2x overdriven setup, you can buy two of the cheap CE Shoplight light fixtures, pull the ballast out of one (and throw the rest away)... Mount the ballast in the first unit, rewire, and you have a 2x overdriven shoplight for under $20.
I have several units like this that work great. I don't use them on my aquariums, since I built a set of 4x ODNO fixtures before I realized that these inexpensive fixtures had electornic ballasts. However, my wife and I own a video production company, and we bought a pile of these to make into 2xODNO lights that we use for video shoots. The output is about 40% higher!
My first DIY Planted Tank:
4x & 2x ODNO Flourescent Lighting (2-6500k, 1-5000k, 1 P&A)
Homebuilt Pressurized CO2 Injection
Rena XP3 Filtration
Still using my original gravel substrate