I came across a 1983 advert for some new bike-shop Apollos for sale in Chilliwack (near Vancouver), BC. Figured this might help for any with the listed models from around that year wondering about their relative place in the line-up and value at the time. They don't list the lower end models (Apollo Sport or Sport 12?) but have some of the mid to upper range on offer:

Apollo Gran Sport 12 - $420 (sale $350)
Apollo Gran Tour - $545 (sale $499)
Apollo Gran Tourist - $550 (Sale $500)
Apollo Imperial - $620 (sale $500)

See:
https://webcache.googleusercontent.c...&ct=clnk&gl=ca

Based on this inflation calculator - Inflation Calculator - Bank of Canada - that would put the 'today' prices for the non-sale prices at $940 for the Gran Sport, around $1200 for the Gran Tour & Gran Tourist, and $1400-ish for the Imperial.