Backlinks to be shown on Alexa Rank , Offer me your Bid

I need to offer me your Bid including : 1- How many backlinks ? 2- No. Of days to be finished. 3- When can I check these backlinks on Alexa Rank I need : 1- DoFollow Backlinks. 2- No SPAM websites. 3- Blog Commenting Backlinks (DoFollow). I need to get backlinks on 2 Keywords FOR 2 Websites . Plz Bid your best on this budget (30$ - 50$) NOTE : The best Offer will get the project Regards.