If you want quality then you have to pay for it as Bumpa says. However on good old Fleabay you can get a set of 4 (2 outer dip/main H4 and 2 inner mains H1) for less then £40 delivered. Here is one example:
https://www.ebay.co.uk/itm/5-3-4-Inch-I ... Swl-Fdne8l
Just search 5 3/1" H1 H4.
I fitted a set of these "cheapies" to my Stag about 8 years ago. They have been OK except after about 5 years they clouded over inside. Not sure what it was but it just wiped off with a clean rag, bit of a faff feeding it through the bulb hole but they still look OK 3 years further on. I recently bought another set for my Sprint. Again they work perfectly well but don't expect A1 quality at this price. The locating lugs (actually bit of bent metal on the rim of the reflector) on one of the outer units would not locate correctly in the original headlamp bowl. Easily fixed by bending with some pliers and nibbling a little bit out of the headlamp bowl. The other thing to note if changing all four (dip.main outer and main inner) is that the new inner lamp is a H1 and the original connector will not fit. New connectors are available on Fleabay for a few ££, I got these, simple snip off the old connector and join the wires, I soldered them and the used heatshrink sleeving.
https://www.ebay.co.uk/itm/392459633566
If you car still has the original headlamps and wiring I would strongly recommend fitting an new feed and earth cables and switching the headlamps via relays. The new halogen bulbs will try to pull a bit more current than the originals putting even more stress on the wiring and more importantly the original light switch and dip switch, chances are they won't last long before failing if you use them for anything other than the annual MoT! Rewiring and fitting relays will also get maximum potential out the bulbs, they will be brighter so worth doing for that reason alone.
Roger