I saw in the equipment list P.293 (CoC 6th ed), prices for a crossbow and bolts, but I couldn't seem to find any data on any kind of crossbow.

I searched 1 or 2 American sites for bows and crossbows. I noted the prices ($300-$899) - crossbows, $169+ for bows.

BOWS AND CROSSBOWS – CALL OF CTHULHU 6TH EDITION

Crossbow#1: Base: 25%, DAM: 2D4+2, RNG: 50, ROF: 1 / 3, HP: 14, MAL: 95, COST: $300
STR/DEX: 11/7

Crossbow#2: Base: 25%, DAM: 2D6+2, RNG: 55, ROF: 1 / 2, HP: 18, MAL: 97, COST: $389
STR/DEX: 13/7
5 x bolts: $30
Quiver (holds 15): $40

Composite Bow: Base: 05%, DAM: 1D8+2+half DB, RNG: 120, ROF: 1, HP: 5, MAL: 00, COST: $169
5 x Arrows: $39
Quiver (holds 15): $40

Arrows and bolts impale.
The above text/data I'm using in my current scenario: The Menace of Dr Gruber.

The costs I've located online on 2 American sites.
I've seen crossbows in the UK (where I live), starting at £249+
Bows I haven't checked.

Any thoughts would be appreciated.

Any thoughts would be apperciated.