subscribeView.swift

import Purchases

struct SubscribeView: View {
    enum Source: String {
        case dashboard, turnip, turnipForm, list, musics
    }
    
    @EnvironmentObject private var subscriptionManager: SubscriptionManager
    @Environment(\.presentationMode) private var presentationMode
    
    let source: Source
    @State private var sheetURL: URL?
    
    private var sub: Purchases.Package? {
        subscriptionManager.monthlySubscription
    }
    
    private var yearlySub: Purchases.Package? {
        subscriptionManager.yearlySubscription
    }
    
    private var lifetime: Purchases.Package? {
        subscriptionManager.lifetime
    }
    
    private func formattedPrice(for package: Purchases.Package) -> String {
        let formatter = NumberFormatter()
        formatter.numberStyle = .currency
        formatter.locale = sub!.product.priceLocale
        return formatter.string(from: package.product.price)!
    }
    

Take a look at package.localizedPriceString. Maybe the formattedPrice is not necessary.
Thanks a lot for sharing your SubscriptionManager!