Really don't use 'much' or 'much of' with plural countable nouns, to take a look at a lot of people today or items. Use lots of or a lot of. The cost of hyperbaric oxygen therapy cost also differs by geographic place. City places tend to have larger treatment costs https://oxygenchambers52840.bloggosite.com/43548236/the-oxygen-therapy-cost-in-mumbai-diaries