As of today's update (Update 17.1), Collector NPCs now function with a Barter Shop interface. We think this increases their accessibility and ease-of-use, compared to the "old" conversation-based interface. We also saw this as an opportunity to give players the ability to purchase low-level augments.
The intention was to increase the price of Augments to properly manage their supply in-game, but due to a technical constraint, all collectible turn-ins had their price increased. For upcoming releases we will be adjusting prices based on the barter value or availability of items, among other factors.
We hope to bring new and more interesting items to offer as well. What would you like to see Collectors offer? We'd love to get your feedback. Thanks!