You need at least 1.5V per cell, so 12V minimum for an eight-cell pack.
You only really need a dedicated charger if you must fast-charge them, as then the cutoff at full charge is critical.
If you do not need fast charge, just using 1/10th the MAH rating (so 80mA) as a charge current and leave it on for 14 - 16 hours minimum.
Leaving them on for a few hours longer is fine, it helps condition the cells.
The voltage in that case can be anything above the minimum, so eg. a 15V or 16V source such as a laptop charger.
Add a resistor so the current is no more than 80mA with 12V on the battery pack.
eg. with a 15V supply so 12V across the resistor, 3 / 0.080 = 37.5
A 39 ohm or two 75 ohm in parallel would be OK, just make sure the resistor has a decent power rating.
Edit:
Or if you want an off-the-shelf unit, one such as these would work:
**broken link removed**
10 cells 16V 500mA 500mA. 4 cells 16V 240mA 500mA. 5 cells 16V 280mA 500mA. 6 cells 16V 396mA 500mA. 7 cells 16V 423mA 500mA. 8 cells 16V 450mA 500mA. 9 cells 16V 480mA 500mA. 800mAh 500mA 1.5 hours.
www.ebay.co.uk
Tamiya Plug.
www.ebay.co.uk