I was just going to post the same question all the recommendations I have seen seem to be for R&G any comments/prices cheaper than £54 for a CBR600F2
I've not seen R&G bungs offered cheaper-than-list-price anywhere, but I
can vouch for their efficiency - worth every penny IMO*.
The only ones I have seen that have bent into the frame have been cheaper ones (
not R&G) that didn't bolt directly into a solid engine-mount point, but instead used a bracket to offset the bung from the mounting point (in order to avoid cutting the fairing.)
If you need the fairing trimming at all, it's a relatively easy job to do on your own... here's my experience of it, from earlier this year
link to post in an old Workshop thread *Obviously if you flip your bike or it hits something solid, some crash-bungs aren't going to save it, but they will help if the bike is sliding along the tarmac, by keeping most of the vital parts off the floor. They saved me a lot of grief when I slid off Croft circuit.