@EasTexRIII its really mush cheaper because they provide fixed rate shipping which means it's cheaper if I'm getting more items.
More importantly, I'm really an idiot. Glad that I learnt my lesson but fortunately not with my life.
Went to get my front wheels replaced and kept thinking that was the main cause of my accident. but Guess what... I was actually riding for a few days with a flat rear tyre. I did noticed that the rear looks deflated (yesterday) and thought maybe I didn't inflate it properly last week.
At the tyre shop, was then showed the nail on the tyre and told that it was already totally flat. Never suffered a flat on a motorcycle (car flat totally don't looked like that, it just go FLAT), I didn't even think that I had a flat.
Moral of the story check you tires. I'm not sure if it's practical to check Everyday so maybe this is an excuse to get a set of TPMS. .