Hi Darreng586. As suggested, there are loads of lights on ebay, some cheap as chips and others like Denali which are expensive. I can't tell you which of the cheap ones are the best but if you go down the cheap route, remember, you need more than two spot lights. You may need to buy additional brackets to mount them, you may need a relay, switch and wiring. If you have other accessories already mounted, it may be a good idea to by a auxiliary connector box that would fit under the seat and keep things safe and tidy.
The price of a couple of cheap spotlights soon mounts up and, I know fitting is a relatively simple job but unless you can do it yourself or, a mate fit them for free then that could incur extra cost.
Have you ridden any distance in the dark to find out if you really need them? Some bikes, like some BMW's definitely need them but personally, I don't think my bike (2012 650 Strom) does as the lights are okay. The other option, if you just want them cause they look good on your crash bars is to just fit them as ornaments, then the cheap ones are okay, just choose the ones that look cool and cost about £20 off Aliexpress. I've ordered items from them, usually cheaper than ebay for the same thing and, although delivery may take a while, they are quite reliable (IMHO). Hope this helps.