$5:

Game Steam Link
TransOcean: The Shipping Company https://store.steampowered.com/app/289930/TransOcean_The_Shipping_Company/
Construction-Simulator 2015 Deluxe Edition https://store.steampowered.com/app/289950/Construction_Simulator_2015/
[COUPON] Construction Simulator - Year 1 Season Pass (50% off) https://store.steampowered.com/app/2323000/Construction_Simulator__Year_1_Season_Pass/
[COUPON] Police Simulator: Patrol Officers: Gold Edition (25% off) https://store.steampowered.com/app/997010/Police_Simulator_Patrol_Officers/

$10: All above, plus:

Game Steam Link
ABRISS - build to destroy https://store.steampowered.com/app/1671480/ABRISS__build_to_destroy/
Bus Simulator 18 https://store.steampowered.com/app/515180/Bus_Simulator_18/
[DLC] Bus Simulator 18 - Official map extension https://store.steampowered.com/app/1058190/Bus_Simulator_18__Official_map_extension/
[DLC] Bus Simulator 18 - MAN Bus Pack 1 https://store.steampowered.com/app/886920/Bus_Simulator_18__MAN_Bus_Pack_1/
[DLC] Bus Simulator 18 - MAN Interior Pack 1 https://store.steampowered.com/app/968910/Bus_Simulator_18__MAN_Interior_Pack_1/
[DLC] Bus Simulator 18 - Mercedes-Benz Bus Pack 1 https://store.steampowered.com/app/1123650/Bus_Simulator_18__MercedesBenz_Bus_Pack_1/
[DLC] Bus Simulator 18 - Mercedes-Benz Interior Pack 1 https://store.steampowered.com/app/968911/Bus_Simulator_18__MercedesBenz_Interior_Pack_1/
[DLC] Bus Simulator 18 - Setra Bus Pack 1 https://store.steampowered.com/app/1149720/Bus_Simulator_18__Setra_Bus_Pack_1/
TransOcean 2: Rivals https://store.steampowered.com/app/350110/TransOcean_2_Rivals/

$20: All above, plus:

Game Steam Link
Firefighting Simulator - The Squad https://store.steampowered.com/app/420560/Firefighting_Simulator__The_Squad/
Bus Simulator 21 Next Stop https://store.steampowered.com/app/976590/Bus_Simulator_21_Next_Stop/

$25: All above, plus:

Game Steam Link
Construction Simulator https://store.steampowered.com/app/1273400/Construction_Simulator/
[DLC] Bus Simulator 21 Next Stop – Gold Upgrade https://store.steampowered.com/app/2306070/Bus_Simulator_21_Next_Stop__Gold_Upgrade/