nik-
Thanks for the input. Don't know about your math, but mine is simple:
All PDF's are PDF standard 75 dots per inch. The watered down gif image you've posted is neither 75dpi nor in the original PDF format. Quality should be the same as any professional Acrobat PDF file you find on the net. Suggest you open these with Adobe Acrobat Reader (free), rather than some of Microsoft's rather cheesy image preview proggies.
Agreed that Flea Markets offer great prices on many things. Glad to see some are carrying SWAT. It's all good.
Rich