the SPC900NC you can buy online, ebay usually has a few, as does Telescopes-astronomy.com.au. The 5x barlow or powermate, any astronomy shop will know what you're looking for.. and a DBK or DMK camera most astronomy shops online will have a fair idea, if they dont stock them, they will likely point you in the direction of someone who does.
Prices.
SPC900NC (without adapter) $75 ~ $100
SPC900NC (with adapter) $145ish
Adapters (
www.moggadapters.com) $45 iirc
5x barlow depending on brand between $49 and $280
DMK21AU (monochrome) camera $449 or there abouts
DBK21AU (color) camera $449 also...
Alex.