Early this year i received from Talbot Weaving 4,5 metres Olive green Ventile L24. Including shipping costs to the Netherlands it did cost me a 150 which was cheaper than the above mentioned addresses.
At the moment i'm finishing my cagoule/anorak i'm making. The rest of the fabric will be used for a shirt.
Concerning the use of ventile on a household sewing machine, make sure you use sharp needles (i use jeans needles 90/14 in combination with Barbour 60 thread, a high strenght, uv resistent mono filament which i had lying around).
When putting parts together i never used needles to pin the parts in place, but used paper clips for edges and double sided tape from Prym (Wondertape) for pockets and zippers instead and then sewed it together.