Crikey - by the time you have phoned or driven round the wreckers you could have paid for the screws from Mazda ten times over. I bought some for the rear valance and they cost me less than $5.
As to the rear bumper query above, this is where I needed my push screws for so I know the location - you can make up the plastic clips, shaping them nicely with a Dremel or similar, and araldite them in the correct place and know one would even see the repair unless they looked closely. The alternative is a new bumper trim part. Hardly a good trade-off.
I'm a great believer in saving $$ where you can but sometimes people take long cuts in an attempt to save money that ultimately cost many times more.
Cheers!
CP_e Standback & PNP; CP_e 3" SS Downpipe; Corksport FMIC with Top-mount K&N filter & OEM Ram CAI; Turbosmart BOV; Dashhawk; Prosport Boost Guage; JBR solid shift bushes; DBA 4000 Wiper-Slot front rotors; Hawk Ferro-Carbon HPS Street front brake pads (@ 69,000km); Sumitomo HTRZIII's in 225/45 x 18