When I went in they said cash was $120 and I also got the same as you when I rang up and was told the price was more plus gst, just go in and say my mate got one for $120 not long ago.
Knowing you're using a business they prob quoted more like a lot of businesses do.
Up to you in the end, I just thought I'd say my 2c and tell you I got it cheaper when I went in.
